/Engine/Plugins/Runtime/RigVM/Source/RigVM/Public/RigVMCore/RigVMStruct.h
Returns all currently existing external variables
[TArray](API\Runtime\Core\Containers\TArray)< [FRigVMExternalVariable](API\Plugins\RigVM\RigVMCore\FRigVMExternalVariable) > GetExternalVariables() const